For me it goes most of the way through the install to the "just doing a few more things" stage then the screen goes black and the circular loading animation just freezes. Sits like this until I reset then the system rolls itself back to 8 and puts up an error message saying Windows 8.1 could not be installed. Tried twice...can't get it to take the update.

Puts up a seemingly generic error code 0xC1900101 0x40019

Not sure exactly where the best log files would be to figure out what it's doing/not doing. Everything I've looked at so far seems fairly normal.

My installation failed and restored to 8.0. Now, I can't install again because the Windows Store gives me the 0x80070008 error. I'm pretty sure it relates to a "Boot" folder on the C drive that's still there, but I can't delete it because Windows is somehow using it.

After installing Windows 8.1 today, my AMD control center does not work. I uninstalled everything (drivers, etc) in Add/Remove programs and then I ran driver sweeper in safe mode. My laptop has the AMD A8-4500M chipset